Railcar including heat-resistant floor
A railcar includes a heat-resistant floor, and the heat-resistant floor includes a floor panel, a heat absorbing layer provided under the floor panel and configured to absorb heat, and a supporting plate configured to support the heat absorbing layer from below. The supporting plate includes contacting portions each configured to contact the heat absorbing layer and separated portions each continuously formed from the contacting portion in a railcar width direction, separated downward from the heat absorbing layer, and extending in a railcar longitudinal direction.
1. A railcar comprising:
a cross beam extending in a railcar width direction; and
a heat-resistant floor supported by the cross beam, wherein:
the heat-resistant floor includes
a floor panel,
a heat absorbing layer provided under the floor panel and configured to absorb heat, and
a supporting plate located above the cross beam and configured to support the heat absorbing layer from below; and
the supporting plate includes
contacting portions each configured to contact the heat absorbing layer, and
separated portions each continuously formed from the contacting portion in the railcar width direction, separated downward from the heat absorbing layer so as not to contact the heat absorbing layer, and extending in a railcar longitudinal direction.
2. The railcar according to claim 1 , wherein the supporting plate is a corrugated plate in which the contacting portions and the separated portions are alternately, continuously provided in the railcar width direction.
3. The railcar according to claim 1 , wherein an air layer is provided between the heat absorbing layer and each of the separated portions.
4. The railcar according to claim 1 , wherein a heat insulating material is provided between the heat absorbing layer and each of the separated portions.
5. The railcar according to claim 1 , wherein the heat absorbing layer expands when absorbing the heat.
6. The railcar according to claim 1 , wherein the heat-resistant floor further includes a heat dispersing layer provided between the floor panel and the heat absorbing layer and configured to disperse the heat in a surface direction.
7. The railcar according to claim 1 , wherein the heat absorbing layer starts absorbing the heat at a temperature of 350 to 550° C.
8. The railcar according to claim 1 , further comprising a side sill extending in the railcar longitudinal direction, an end portion of the cross beam being inserted into the side sill, wherein:
the side sill opens inwardly in the railcar width direction and includes an upper surface portion located at an upper side, a side surface portion coupled to the upper surface portion, and a lower surface portion coupled to the side surface portion and opposed to the upper surface portion;
the upper surface portion of the side sill includes a step portion located lower than the other portion of the upper surface portion of the side sill such that the step portion contacts an upper surface of the cross beam; and
a lower surface of the separated portion located at an end portion of the supporting plate in the railcar width direction contacts an upper surface of the step portion.
9. The railcar according to claim 1 , further comprising a side sill extending in the railcar longitudinal direction, an end portion of the cross beam being inserted into the side sill, wherein:
the side sill opens inwardly in the railcar width direction and includes an upper surface portion located at an upper side, a side surface portion coupled to the upper surface portion, and a lower surface portion coupled to the side surface portion and opposed to the upper surface portion;
the upper surface portion of the side sill includes a step portion located lower than the other portion of the upper surface portion of the side sill such that the step portion contacts an upper surface of the cross beam; and the upper surfaces of the contacting portions of the supporting plate are located lower than an upper surface of the upper surface portion of the side sill.